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A199527
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Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements
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1
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1, 10, 90, 860, 8470, 84852, 860854, 8815392, 90927530, 943302430, 9832131238, 102882332054, 1080105471952, 11371474312404, 120012768975248, 1269300095287288, 13449845528174042, 142756162602411602
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..1...-2...-3....4....5...-2...-2...-1...-2...-4...-3...-4....4....1...-1...-2
..1....0....4...-4...-5....1...-5....4....1....5....3...-5...-3...-1....1...-4
.-4...-2....2....2....0....3....3...-3...-4....2....2...-1....1....5...-2....4
.-1....4....0...-4...-3....2....3...-4....1...-3....2....5...-5...-5...-3....0
..3....0...-3....2....3...-4....1....4....4....0...-4....5....3....0....5....2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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